Cold resistance detection device and method for evaluating cold resistance of pennisetum alopecuroides based on spectral analysis

Abstract

The invention relates to the technical field of cold resistance evaluation, in particular to a cold resistance detection device and a Chinese pennisetum cold resistance evaluation method based on spectral analysis. The device comprises a containing pipe, a reflux condensing pipe, an extension pipe, a liquid supplementing pipe and a control core. And when the balance weight plugging piece is jacked up by the airflow, the valve is jacked open by the core body, so that the solvent is supplemented. The method comprises the following steps: carrying out low-temperature treatment on a pennisetum alopecuroides detection sample, and detecting the low-temperature exudation concentration of potassium ions in a preset amount of solvent by atomic absorption spectrometry; after the heat treatment is finished, supplementing the solvent in the accommodating tube to a preset amount, and detecting the high-temperature exudation concentration of the potassium ions by atomic absorption spectrometry; and determining the low-temperature seepage rate of the potassium ions according to the low-temperature seepage concentration and the high-temperature seepage concentration, and evaluating the cold resistance of the pennisetum alopecuroides detection sample according to the low-temperature seepage rate. The method simultaneously realizes small dosage, high efficiency and low risk in the detection process, and ensures high efficiency and smooth proceeding of the detection work.

Description

Technical Field

[0001] The invention relates to the technical field of cold resistance evaluation, and in particular to a cold resistance detection device and a cold resistance evaluation method of Pennisetum based on spectral analysis. Background Art

[0002] In the research of cold resistance, it is often necessary to detect the potassium ion exudation rate under different low temperature environments. In the prior art, when detecting the potassium ion exudation rate, in order to improve the detection efficiency and reduce the detection cost, it is usually selected to use less test samples with less solvent for detection. When taking this approach, when detecting the complete release concentration of potassium ions, it is usually necessary to boil and keep it for a period of time. In this process, the solvent often burns out accidentally, resulting in experimental failure. In order to avoid accidental drying of the solvent, staff are usually required to keep guarding during the heat treatment time, which is physically demanding.

[0003] Although using more test samples and more solvents for testing can reduce the probability of accidental drying of the solvent, the energy consumed in the heat treatment process will increase significantly. At the same time, due to the large amount of solvent used, the risk of burns increases, the size of the equipment will also increase, and the convenience of operation will decrease.

[0004] In view of this, this application is hereby filed. Summary of the invention

[0005] The first purpose of the present invention is to provide a cold resistance detection device, which can effectively reduce the probability of accidental burning of the solvent while realizing the detection using a smaller amount of test sample and a smaller amount of solvent, thereby ensuring the efficient and smooth progress of the detection work.

[0006] The second object of the present invention is to provide a method for evaluating the cold resistance of Pennisetum based on spectral analysis, which simultaneously achieves small dosage, high efficiency and low risk in the detection process, and ensures the efficient and smooth progress of the detection work.

[0007] The embodiment of the present invention is achieved as follows: A cold resistance detection device comprises: a containing tube, a reflux condensing tube, an extension tube, a liquid replenishing tube and a control core.

[0008] The receiving tube is used to receive the test sample and the solvent. The receiving tube is connected to the reflux condenser, and the extension tube is connected to the end of the reflux condenser away from the receiving tube and is connected to the reflux condenser. An emptying port is provided on the side wall of the extension tube. One end of the infusion tube is closed by a sealing block, and the end of the extension tube away from the reflux condenser is connected to the sealing block. The sealing block is provided with a connecting hole for connecting the infusion tube and the extension tube, and a valve is provided at the end of the connecting hole away from the extension tube. When the infusion tube contains the solvent, the valve is closed.

[0009] The control core includes a core body and a counterweight plugging piece. The core body passes through the counterweight plugging piece and is fixedly connected to the counterweight plugging piece. The diameter of the core body is smaller than the inner diameter of the reflux condenser tube. One end of the core body fits in the reflux condenser tube, and the other end of the core body fits in the connecting hole. The counterweight plugging piece is located in the extension tube. In a natural state, the counterweight plugging piece abuts against one end of the reflux condenser tube away from the receiving tube, thereby blocking the reflux condenser tube.

[0010] When the airflow pushes up the counterweight sealing member, the core pushes the valve open.

[0011] Furthermore, the control core also includes: a drainage needle.

[0012] The core body has an axial through hole extending along the axial direction and penetrating the core body, and the drainage needle is accommodated in the core body and is arranged to extend along the axial direction of the core body. The diameter of the drainage needle is smaller than the inner diameter of the core body, and the drainage needle is fixedly connected to the core body.

[0013] The drainage needle extends beyond one end of the core body away from the accommodating tube. When the airflow lifts the counterweight blocking piece, the drainage needle pushes the valve open.

[0014] Furthermore, a radial rod is fixedly connected in the receiving tube, a matching column is fixedly connected to the radial rod, the matching column is coaxially arranged with the core body, and the diameter of the matching column is adapted to the inner diameter of the core body. The core body extends into the receiving tube, and the matching column is matched in the core body.

[0015] When the airflow lifts the counterweight sealing member, the core moves toward the liquid infusion tube and separates from the matching column.

[0016] Furthermore, an isolation member is provided in the containing tube, and the isolation member includes a first mesh plate, a connecting column and a second mesh plate.

[0017] The first mesh plate and the second mesh plate are both arranged perpendicular to the axis of the containing tube and spaced apart from each other. The first mesh plate is located on the side of the second mesh plate close to the bottom of the containing tube, and the connecting column fixedly connects the first mesh plate and the second mesh plate.

[0018] The isolating piece is detachably installed in the containing tube, and the isolating piece is located on a side of the matching column away from the bottom of the containing tube.

[0019] The connecting column is coaxially arranged with the core body, and a matching through hole which is arranged along the axial direction and penetrates the connecting column is provided on the connecting column, and the core body is slidably matched in the matching through hole.

[0020] Furthermore, a notch is provided on the side wall of the connecting column, and the notch runs through the inner side wall of the connecting column to the outer side wall thereof.

[0021] The notch extends from one end of the connecting column close to the first mesh plate along its axial direction toward the second mesh plate. The core body is fixedly connected with a stirring rod, and the stirring rod extends between the first mesh plate and the second mesh plate through the notch.

[0022] Furthermore, a stop column is fixedly connected to one side of the sealing block away from the extension tube, and the stop column extends along the axial direction of the infusion tube. A floating plate is arranged inside the infusion tube.

[0023] When the liquid level in the infusion tube is lower than the stop post, the float plate fits against the stop post. When the airflow lifts the counterweight sealing piece, the drainage needle pushes the valve open and lifts the float plate, so that when the drainage needle is reset, the float plate can hit the stop post and make a prompt sound.

[0024] A method for evaluating the cold resistance of Pennisetum truncatum based on spectral analysis comprises the following steps: S1. Prepare Pennisetum test samples.

[0025] S2. The Pennisetum test sample is subjected to low temperature treatment, and the low temperature seepage concentration of potassium ions is detected by atomic absorption spectrometry in a preset amount of solvent.

[0026] S3. Place the Pennisetum test sample processed by S2 into the holding tube of the cold resistance testing device, add a preset amount of solvent into the holding tube, and add a supplementary solvent into the liquid infusion tube.

[0027] S4. A cooling medium is introduced into the reflux condenser to heat the receiving tube and make the solvent boil for a preset time. After the heat treatment is completed, the amount of solvent in the receiving tube is replenished to a preset amount, and the high-temperature seepage concentration of potassium ions is detected by atomic absorption spectroscopy.

[0028] S5. Determine the low-temperature seepage rate of potassium ions based on the low-temperature seepage concentration and the high-temperature seepage concentration, and evaluate the cold resistance of the Pennisetum test sample based on the low-temperature seepage rate.

[0029] Furthermore, the method for evaluating the cold resistance of Pennisetum based on spectral analysis also includes the step: S6, subjecting the Pennisetum test sample to low-temperature treatment, obtaining cell activity data of the Pennisetum test sample using Raman spectroscopy, and evaluating the cold resistance of the Pennisetum test sample based on the cell activity data.

[0030] The beneficial effects of the technical solution of the embodiment of the present invention include: During use of the cold resistance detection device provided by an embodiment of the present invention, when the heating efficiency increases due to fluctuations, the amount of steam generated per unit time will increase, and may exceed the condensation efficiency of the reflux condenser, causing a portion of the steam to directly lift the counterweight sealing member. This portion of steam is eventually discharged through the exhaust port of the extension tube, which facilitates balancing the air pressure in the containing tube and ensures safety.

[0031] At the same time, due to the discharge of part of the steam from the vent, part of the solvent in the containment tube is lost. When the airflow lifts the counterweight plugging piece, the core body can push the valve open, and the solvent in the infusion tube is guided by the control core and finally drained into the containment tube along the core body, so as to replenish the solvent and further prevent the solvent from being accidentally burned out. When the excess steam is discharged, the counterweight plugging piece is reset under the action of gravity.

[0032] In general, the cold resistance detection device provided by the embodiment of the present invention can effectively reduce the probability of accidental drying of the solvent while realizing the detection using a small amount of detection sample and a small amount of solvent, thereby ensuring the efficient and smooth progress of the detection work. The cold resistance evaluation method of Pennisetum based on spectral analysis provided by the embodiment of the present invention simultaneously realizes the small amount of detection process, high efficiency and low risk, thereby ensuring the efficient and smooth progress of the detection work. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A schematic diagram of the overall structure of the cold resistance detection device provided by an embodiment of the present invention (when the counterweight blocking member is not lifted up); Figure 2 for Figure 1 Schematic diagram of the structure of the middle A area; Figure 3 for Figure 1 Schematic diagram of the structure of the middle B area; Figure 4 A schematic diagram of the overall structure of the cold resistance detection device provided by an embodiment of the present invention (when the counterweight blocking member is lifted up); Figure 5 for Figure 4 Schematic diagram of the structure of the middle C area; Figure 6 for Figure 4 Schematic diagram of the structure of region D in the middle.

[0035] Description of reference numerals: The container 100 comprises a radial rod 110, a matching column 120, a reflux condenser 200, an extension tube 300, a drain port 310, a refill tube 400, a sealing block 410, a connecting hole 411, a valve 412, a stop column 420, a floating plate 430, a core body 510, a weighted plugging member 520, a drainage needle 530, an agitating rod 540, an isolating member 600, a first mesh plate 610, a second mesh plate 620, a connecting column 630, and a notch 640. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0040] In addition, the terms "parallel", "vertical", etc. do not mean that the components must be absolutely parallel or vertical, but can be slightly tilted. For example, "parallel" only means that its direction is more parallel than "vertical", and does not mean that the structure must be completely parallel, but can be slightly tilted.

[0041] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In order to solve the deficiencies in the prior art, please refer to Figure 1 to Figure 6The present embodiment provides a cold resistance detection device, which includes: a containing tube 100, a reflux condensing tube 200, an extension tube 300, a liquid replenishing tube 400 and a control core.

[0043] The containing tube 100 is used to contain the test sample and the solvent, and the solvent can be deionized water.

[0044] The receiving tube 100 is connected to the reflux condensing tube 200, and the reflux condensing tube 200 is extended along the axial direction of the receiving tube 100. The extension tube 300 is connected to one end of the reflux condensing tube 200 away from the receiving tube 100 and is connected to the reflux condensing tube 200, and the extension tube 300 is extended along the axial direction of the reflux condensing tube 200. The side wall of the extension tube 300 is provided with an exhaust port 310.

[0045] One end of the liquid replenishing tube 400 is closed by a sealing block 410 , one end of the extension tube 300 away from the reflux condensing tube 200 is connected to the sealing block 410 , and the liquid replenishing tube 400 is extended along the axial direction of the extension tube 300 .

[0046] The sealing block 410 is provided with a connecting hole 411 for connecting the infusion tube 400 and the extension tube 300. The end of the connecting hole 411 away from the extension tube 300 is equipped with a valve 412. When the infusion tube 400 contains a solvent, the valve 412 is closed.

[0047] The control core includes a core body 510 and a counterweight plugging member 520, wherein the core body 510 penetrates the counterweight plugging member 520 and is fixedly connected to the counterweight plugging member 520. The diameter of the core body 510 is smaller than the inner diameter of the reflux condenser tube 200, one end of the core body 510 is fitted in the reflux condenser tube 200, and the other end of the core body 510 is fitted in the communicating hole 411, and the counterweight plugging member 520 is located in the extension tube 300.

[0048] In a natural state, the counterweight plugging member 520 abuts against an end portion of the reflux condenser tube 200 away from the receiving tube 100 , thereby plugging the reflux condenser tube 200 .

[0049] When the airflow pushes up the counterweight sealing member 520 , the core body 510 pushes the valve 412 open.

[0050] The cold resistance testing device is used to heat the test sample at a high temperature so as to inactivate the cells of the test sample and fully release potassium ions. In this way, the potassium ion release rate of the test sample after low temperature treatment can be obtained in combination with the potassium ion release concentration of the test sample after low temperature treatment, which can be used to evaluate the cold resistance of the test sample.

[0051] During use of the cold resistance detection device, when the solvent (taking deionized water as an example) in the containing tube 100 is heated and kept boiling, the water vapor condenses in the reflux condenser 200 and refluxes into the containing tube 100, which can effectively reduce volume loss and reduce the probability of accidental drying of the solvent.

[0052] Since the cold resistance detection device is mainly used for small-volume detection tests, the overall volume of the cold resistance detection device can be made smaller, and the volumes of the containment tube 100, the reflux condenser 200, the extension tube 300 and the infusion tube 400 are relatively small, and the flow rate requirements for the cooling medium are reduced. Since the amount of the test sample and the solvent in the containment tube 100 is relatively small, and the heating efficiency cannot be completely stable when the containment tube 100 is heated, the heating efficiency may fluctuate within a certain range, and therefore, the amount of solvent steam also fluctuates. When the heating efficiency increases due to fluctuations, the amount of steam generated per unit time will increase, and may exceed the condensation efficiency of the reflux condenser 200, causing a portion of the steam to directly lift the counterweight sealing member 520, and this portion of the steam is eventually discharged through the exhaust port 310 of the extension tube 300, which is convenient for balancing the air pressure in the containment tube 100 and ensuring safety.

[0053] At the same time, due to the discharge of a part of the steam from the exhaust port 310, a part of the solvent in the receiving tube 100 is lost, and when the airflow lifts the counterweight plugging member 520, the core 510 can push open the valve 412, and the solvent in the infusion tube 400 is guided by the control core and finally drained into the receiving tube 100 along the core 510, so as to replenish the solvent and further prevent the solvent from being accidentally burned out. When the excess steam is discharged, the counterweight plugging member 520 is reset under the action of gravity.

[0054] It is understood that the amount of solvent added from the infusion tube 400 when the control core pushes up the valve 412 once can be controlled by adjusting the weight of the counterweight plugging member 520 and the aperture of the communication hole 411. Optionally, the amount of solvent added from the infusion tube 400 when the control core pushes up the valve 412 once can be set to be less than or equal to the amount of solvent corresponding to the steam discharged when the counterweight plugging member 520 is pushed up.

[0055] In general, the cold resistance detection device provided in this embodiment can effectively reduce the probability of accidental burning of the solvent while realizing detection using a smaller amount of detection sample and a smaller amount of solvent, thereby ensuring efficient and smooth detection.

[0056] In this embodiment, the control core further includes: a drainage needle 530 .

[0057] The core body 510 has an axial through hole extending along the axial direction thereof and penetrating the core body 510, and the drainage needle 530 is accommodated in the core body 510 and is arranged to extend along the axial direction of the core body 510. The diameter of the drainage needle 530 is smaller than the inner diameter of the core body 510, and the drainage needle 530 is coaxially fixedly connected to the core body 510. Optionally, the drainage needle 530 can be connected to the inner wall of the core body 510 through a connecting wire (not shown in the figure), and the diameter of the connecting wire is smaller than or equal to the diameter of the drainage needle 530.

[0058] The outer diameter of the core body 510 is matched with the aperture of the connecting hole 411, and the core body 510 can be slidably fitted in the connecting hole 411. The drainage needle 530 extends to the end of the core body 510 away from the receiving tube 100. When the airflow lifts the counterweight plugging member 520, the core body 510 pushes the valve 412 open through the drainage needle 530, so that the solvent in the infusion tube 400 is finally added to the receiving tube 100 through the axial through hole of the core body 510 under the guidance of the drainage needle 530. Through this design, the smoothness of solvent addition is improved and the loss of solvent during the addition process is reduced.

[0059] Furthermore, a radial rod 110 is fixedly connected inside the receiving tube 100, and a matching column 120 is fixedly connected to the radial rod 110. The matching column 120 is coaxially arranged with the core body 510, and the diameter of the matching column 120 is adapted to the inner diameter of the core body 510. The core body 510 extends into the receiving tube 100, and the matching column 120 is matched in the core body 510.

[0060] When the airflow lifts the counterweight plugging piece 520, the core 510 moves toward the infusion tube 400 and separates from the matching column 120. That is, when the counterweight plugging piece 520 is not lifted, the matching column 120 is matched with the core 510, thereby sealing the lower end of the core 510 to prevent the steam from being lost through the axial through hole of the core 510, and when the airflow lifts the counterweight plugging piece 520, the core 510 is separated from the matching column 120, and the lower end of the core 510 is opened, which facilitates the drainage needle 530 to smoothly add the solvent to the mixed system of the containing tube 100.

[0061] Specifically, an isolation member 600 is further disposed in the housing tube 100 , and the isolation member 600 includes a first mesh plate 610 , a connecting column 630 and a second mesh plate 620 .

[0062] The first mesh plate 610 and the second mesh plate 620 are both arranged perpendicular to the axis of the container tube 100 and are spaced apart from each other. The first mesh plate 610 is located on the side of the second mesh plate 620 close to the bottom of the container tube 100 , and the connecting column 630 fixes the first mesh plate 610 and the second mesh plate 620 together.

[0063] The isolating member 600 is detachably mounted in the containing tube 100, and is located on the side of the matching column 120 away from the bottom of the containing tube 100. The first mesh plate 610 and the second mesh plate 620 are used to accommodate the test sample, so as to prevent the test sample from adhering to the bottom of the containing tube 100, thereby reducing the possibility of the test sample being burned due to adhesion.

[0064] The connecting column 630 is coaxially arranged with the core body 510 . The connecting column 630 is provided with a matching through hole arranged along its axial direction and passing through it. The outer diameter of the core body 510 is matched with the hole diameter of the matching through hole, and the core body 510 is slidably fitted in the matching through hole.

[0065] A notch 640 is formed on the side wall of the connecting post 630 , and the notch 640 penetrates from the inner side wall of the connecting post 630 to the outer side wall thereof.

[0066] The notch 640 extends from one end of the connecting column 630 close to the first mesh plate 610 along its axial direction toward the second mesh plate 620. The core 510 is fixedly connected with a stirring rod 540, and the stirring rod 540 extends between the first mesh plate 610 and the second mesh plate 620 through the notch 640. In this way, when the airflow lifts the counterweight plugging member 520, the core 510 will also drive the stirring rod 540 to move, thereby stirring the test sample between the first mesh plate 610 and the second mesh plate 620, which helps the test sample to fully release potassium ions, while reducing the possibility of the test sample blocking the mesh holes of the first mesh plate 610 and the second mesh plate 620.

[0067] Furthermore, a stopper column 420 is fixedly connected to one side of the sealing block 410 away from the extension tube 300, and the stopper column 420 extends along the axial direction of the liquid infusion tube 400. A floating plate 430 is disposed in the liquid infusion tube 400. The density of the floating plate 430 is lower than the density of the solvent.

[0068] When the liquid level in the infusion tube 400 is lower than the stop column 420, the float plate 430 fits against the stop column 420. When the airflow lifts the counterweight sealing member 520, the drainage needle 530 pushes open the valve 412 and lifts the float plate 430, so that when the drainage needle 530 is reset, the float plate 430 can hit the stop column 420 to make a warning sound, which is used to remind the staff to pay attention to the amount of solvent, thereby serving as a reminder to prevent the staff from forgetting and causing the solvent to accidentally burn out.

[0069] In addition, the floating plate 430 can reduce the oscillation amplitude of the solvent liquid level in the liquid infusion tube 400 , and can prevent the solvent in the liquid infusion tube 400 from being swung out from the mouth of the liquid infusion tube 400 during the process of the counterweight sealing member 520 being repeatedly lifted.

[0070] In this embodiment, the counterweight sealing member 520 is configured to be spherical, and the counterweight sealing member 520 is coaxially fixedly connected to the core body 510 .

[0071] This embodiment also provides a method for evaluating the cold resistance of Pennisetum based on spectral analysis, the method comprising the following steps: S1. Prepare Pennisetum test samples.

[0072] S2. Perform low-temperature treatment on the Pennisetum test sample, fully release potassium ions from the low-temperature treated Pennisetum test sample in a preset amount of solvent, and detect the low-temperature seepage concentration of potassium ions by atomic absorption spectroscopy.

[0073] S3. Wash and dry the Pennisetum test sample processed by S2 and place it into the containing tube 100 of the cold resistance testing device, add the same preset amount of solvent as in S2 into the containing tube 100, and add the supplementary solvent into the liquid infusion tube 400.

[0074] S4, introducing cooling medium into the reflux condenser 200, heating the receiving tube 100 and making the solvent boil for a preset time, replenishing the amount of solvent in the receiving tube 100 to a preset amount after the heat treatment, and detecting the high-temperature seepage concentration of potassium ions by atomic absorption spectroscopy.

[0075] S5. Determine the low-temperature seepage rate of potassium ions based on the low-temperature seepage concentration and the high-temperature seepage concentration, and evaluate the cold resistance of the Pennisetum test sample based on the low-temperature seepage rate.

[0076] S6. Subject the Pennisetum test samples to low temperature treatment, obtain cell activity data of the Pennisetum test samples using Raman spectroscopy, and evaluate the cold resistance of the Pennisetum test samples based on the cell activity data.

[0077] Combining the results of S5 and S6, a multi-spectral comprehensive analysis of the cold resistance of Pennisetum test samples was achieved.

[0078] In summary, the cold resistance detection device provided by the embodiment of the present invention can effectively reduce the probability of accidental drying of the solvent while realizing the detection using a small amount of detection sample and a small amount of solvent, thereby ensuring the efficient and smooth progress of the detection work. The cold resistance evaluation method of Pennisetum based on spectral analysis provided by the embodiment of the present invention simultaneously realizes small dosage, high efficiency and low risk in the detection process, thereby ensuring the efficient and smooth progress of the detection work.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cold resistance detection device, characterized in that: include: A containing tube, a reflux condenser tube, an extension tube, a liquid replenishing tube and a control core; The containing tube is used to contain the test sample and the solvent; The receiving tube is connected to the reflux condensing tube, the extension tube is connected to one end of the reflux condensing tube away from the receiving tube and is connected to the reflux condensing tube; a drain port is provided on the side wall of the extension tube; one end of the infusion tube is closed by a sealing block, and one end of the extension tube away from the reflux condensing tube is connected to the sealing block; the sealing block is provided with a connecting hole connecting the infusion tube and the extension tube, and a valve is provided at one end of the connecting hole away from the extension tube; when the infusion tube contains the solvent, the valve is closed; The control core comprises a core body and a counterweight plugging piece, the core body passes through the counterweight plugging piece and is fixedly connected to the counterweight plugging piece; the diameter of the core body is smaller than the inner diameter of the reflux condenser tube, one end of the core body is fitted into the reflux condenser tube, the other end of the core body is fitted into the connecting hole, and the counterweight plugging piece is located in the extension tube; in a natural state, the counterweight plugging piece abuts against one end of the reflux condenser tube away from the receiving tube, thereby plugging the reflux condenser tube; When the airflow pushes up the counterweight sealing member, the core pushes open the valve.

2. The cold resistance detection device according to claim 1, characterized in that: The control core further comprises: a drainage needle; The core body has an axial through hole extending along the axial direction thereof and penetrating the core body, and the drainage needle is accommodated in the core body and is arranged to extend along the axial direction of the core body; the diameter of the drainage needle is smaller than the inner diameter of the core body, and the drainage needle is fixedly connected to the core body; The drainage needle extends to the outside of one end of the core body away from the accommodating tube; when the airflow pushes up the counterweight sealing member, the drainage needle pushes open the valve.

3. The cold resistance detection device according to claim 2, characterized in that: A radial rod is fixedly connected inside the receiving tube, and a matching column is fixedly connected to the radial rod. The matching column is coaxially arranged with the core body, and the diameter of the matching column is adapted to the inner diameter of the core body; the core body extends into the receiving tube, and the matching column is matched in the core body; When the airflow lifts up the counterweight sealing member, the core moves toward the fluid infusion tube and separates from the matching column.

4. The cold resistance detection device according to claim 3, characterized in that: The containing tube is provided with an isolating member, and the isolating member comprises a first mesh plate, a connecting column and a second mesh plate; The first mesh plate and the second mesh plate are both arranged perpendicular to the axis of the containing tube and are spaced apart from each other. The first mesh plate is located on a side of the second mesh plate close to the bottom of the containing tube, and the connecting column fixedly connects the first mesh plate and the second mesh plate. The isolating member is detachably mounted in the containing tube, and the isolating member is located on a side of the matching column away from the bottom of the containing tube; The connecting column is coaxially arranged with the core body, and the connecting column is provided with a matching through hole which is arranged along the axial direction thereof and penetrates the connecting column, and the core body is slidably fitted in the matching through hole.

5. The cold resistance detection device according to claim 4, characterized in that: A notch is formed on the side wall of the connecting column, and the notch extends from the inner side wall of the connecting column to the outer side wall thereof; The notch extends from one end of the connecting column close to the first mesh plate along its axial direction toward the second mesh plate; the core body is fixedly connected with a stirring rod, and the stirring rod extends from the notch to between the first mesh plate and the second mesh plate.

6. The cold resistance detection device according to claim 2, characterized in that: A stop column is fixedly connected to one side of the sealing block away from the extension tube, and the stop column extends along the axial direction of the infusion tube; a floating plate is arranged inside the infusion tube; When the liquid level in the infusion tube is lower than the stop post, the float plate fits against the stop post. When the airflow lifts the counterweight sealing member, the drainage needle pushes open the valve and lifts the float plate, so that when the drainage needle is reset, the float plate can hit the stop post to emit a prompt sound.

7. A method for evaluating the cold resistance of Pennisetum based on spectral analysis, characterized in that: The steps include: S1. Prepare Pennisetum test samples; S2, subjecting the Pennisetum test sample to low temperature treatment, and detecting the low temperature seepage concentration of potassium ions by atomic absorption spectrometry in a preset amount of solvent; S3, placing the Pennisetum test sample processed by S2 into the receiving tube of the cold resistance testing device according to any one of claims 1 to 6, adding the preset amount of the solvent into the receiving tube, and adding the solvent for replenishment into the liquid infusion tube; S4, introducing a cooling medium into the reflux condenser, heating the receiving tube and causing the solvent to boil for a preset time, replenishing the amount of solvent in the receiving tube to the preset amount after the heat treatment is completed, and detecting the high-temperature seepage concentration of potassium ions by atomic absorption spectroscopy; S5. Determine the low-temperature seepage rate of potassium ions according to the low-temperature seepage concentration and the high-temperature seepage concentration, and evaluate the cold resistance of the Pennisetum test sample according to the low-temperature seepage rate.

8. The method for evaluating the cold resistance of Pennisetum truncatum based on spectral analysis according to claim 7, characterized in that: The following steps are also included: S6. Perform low-temperature treatment on the Pennisetum test sample, obtain cell activity data of the Pennisetum test sample using Raman spectroscopy, and evaluate the cold resistance of the Pennisetum test sample based on the cell activity data.

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